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Registered Member #242
Joined: Thu Feb 23 2006, 11:37PM
Location: Erie PA
Posts: 210
So we had a little clean up day at work today. We cleaned out the electronics lab and threw out a bunch of unused stuff.
I managed to set aside some stuff for myself: 14 doorknob style caps, 4uF 1500Vdc nom. 70A rms, 1100A peak repetitive. 4 SCR rectifiers 1400Vdc and 500A. 3 current transducers a handfull of hocky puck SCRs
We're only about half way through throwing stuff out, so there is probably some other stuff I can get.
Now for the best part! One of the main power electronics engineers was in the lab throwing out some stuff and I mentioned that I would like to get my hands on one of the big line filter caps used on the DC bus that feeds the traction motor inverters. He said that they are currently doing a supplier qualification test on 10 of them, and they will be junking them when finished. I think they're rated around 2700uF and 1400VDC nominal. They should be done with testing in a week or two.
Looks like I may be building a quarter shrinker as my next project :)
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Nice
A couple of years ago I worked as an engineer for railway train maintenance if those capacitors are dry film polypropylene types they're fantastic - until they get hot ! We had a couple explode during a very hot (by uk standards) summer They burst open a steel box (several mm thick steel) Distorted steel cross-members and blew the skirts off (panels that cover the ugly bits at the bottom of the train below floor-level. Luckily no one got hurt.
So make absolutely certain that you don't let them get hot Probably your Power Electronics guy will know more.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Probably on a par with me finding a pile of 12 hockey puck SCR's in the dirt at our scrap metal place. Only cost a few bucks. Set up here and wired as a diode stack. Took 12kA before they blew at 15.
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